CN110243268B - Concrete volume linear deformation tester and testing method - Google Patents
Concrete volume linear deformation tester and testing method Download PDFInfo
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- CN110243268B CN110243268B CN201910494827.5A CN201910494827A CN110243268B CN 110243268 B CN110243268 B CN 110243268B CN 201910494827 A CN201910494827 A CN 201910494827A CN 110243268 B CN110243268 B CN 110243268B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/30—Measuring arrangements characterised by the use of mechanical techniques for measuring the deformation in a solid, e.g. mechanical strain gauge
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Abstract
The invention provides a concrete volume linear deformation tester and a testing method. The tester comprises a dial indicator, an embedded part, a base, a cylinder, a connecting rod, a transmission rod and a supporting rod; the base is used for fixing the support rod and the bearing cylinder; the cylinder is used for containing concrete to be tested; the embedded part comprises a screw and an arc-shaped tray arranged at the top of the screw, the screw is used for being embedded into the concrete to be tested from the top, and the arc-shaped tray is exposed at the top of the concrete to be tested; the supporting rod is erected on the base; the connecting rod is used for sleeving the transfer rod; the dial gauge is used for detecting the volume linear deformation of the concrete through the transmission rod and the embedded part; the transmission rod is longitudinally arranged and abutted between the measuring rod of the dial indicator and the arc-shaped tray of the embedded part, and is used for transmitting the longitudinal displacement of the embedded part generated along with the concrete to be measured to the dial indicator upwards. The invention has simple structure and convenient operation, and can observe the volume change condition of the whole process of the concrete from initial setting to final setting in real time.
Description
Technical Field
The invention relates to a concrete detection device, in particular to a concrete volume linear deformation tester and a test method.
Background
The concrete is a complex physical change and chemical reaction process from initial setting to final setting. Numerous experimental studies have shown that: the volume of concrete can shrink in the hardening process, and the degree of shrinkage deformation is influenced by factors such as the fineness of cement, the types of admixtures, temperature and humidity and the like.
The strength begins to form after the initial setting of the concrete, more micro cracks are generated due to the volume change in the process from the initial setting to the final setting, and the later structural crack development is accelerated due to the volume change after the final setting of the concrete. The crack of the structure can affect the whole construction quality and safety, and especially underground engineering, a structure under the action of tensile stress or concrete engineering with waterproof requirements need to control the generation and development of the crack. In order to prevent cracks, additives such as magnesium expanding agent or calcium expanding agent are often added to the concrete to inhibit the shrinkage or expansion of the concrete.
The mixing amount of the expanding agent is determined according to the deformation of the concrete after 28 days of curing, and the volume deformation of the concrete after the admixture is mixed in the whole hardening process is also verified by tests. Therefore, instruments which are convenient to use and easy to operate are required to meet the requirement of testing the deformation quantity of the concrete in construction sites and concrete mixing stations.
Disclosure of Invention
The invention aims to provide a concrete volume linear deformation tester to solve the problem that the volume linear deformation from initial setting to final setting of concrete is difficult to measure in real work.
The invention also aims to provide a method for testing the volume linear deformation of the concrete so as to obtain a volume linear deformation curve of the concrete in the process from initial setting to final setting.
One of the objects of the invention is achieved by: the utility model provides a concrete volume linear deformation tester, characterized by includes:
the base is used for fixing the support rod and the bearing cylinder;
the cylinder body is a barrel-shaped body with an upper opening, the lower end of the cylinder body is fixed on the base, and the cylinder body is used for containing concrete to be tested;
the embedded part comprises a screw and an arc-shaped tray arranged at the top of the screw, the screw is used for being embedded into the concrete to be tested from the top, and the arc-shaped tray is exposed at the top of the concrete to be tested;
a support rod standing on the base;
the connecting rod is transversely connected to the supporting rod and is used for sleeving the transfer rod;
the dial indicator is used for detecting the volume linear deformation of the concrete through the embedded part; and
and the transmission rod is longitudinally arranged and abutted between the measuring rod of the dial indicator and the arc-shaped tray of the embedded part, and is used for upwards transmitting the longitudinal displacement of the embedded part generated along with the concrete to be detected to the dial indicator.
The transmission rod is a straight rod, and the lower end of the transmission rod is a spherical body which is used for being in contact with the inner disc surface of the arc-shaped tray of the embedded part.
Be equipped with the annular arch that upwards inboard was equipped with the screw thread on the base, the lower extreme of barrel pass through the screw thread with the annular arch links together to the realization with linking firmly of base.
The lower end of the supporting rod is screwed in the threaded hole in the base through threads on the surface.
The second purpose of the invention is realized by the following steps: a method for testing the volume linear deformation of concrete comprises the following steps:
a. preparing a tester for the linear deformation of the concrete volume;
b. coating a release agent or engine oil on the inner wall of the cylinder body and the surface of a base in the cylinder body;
c. uniformly filling concrete to be tested into the cylinder from the upper end opening of the cylinder;
d. inserting the lower screw of the embedded part into the concrete to be tested from the opening at the upper end of the cylinder;
e. mounting a support rod on the base, sleeving the transmission rod in a sleeve ring on the support rod in a penetrating manner, and enabling the lower end of the transmission rod to abut against the upper part of the embedded part;
f. installing a dial indicator on the supporting rod, enabling a measuring rod of the dial indicator to be in contact with the upper end of the transmission rod, and adjusting a pointer of the dial indicator to a median position;
g. and reading the dial indicator at regular intervals to obtain a linear deformation curve of the volume of the concrete to be measured.
The device has simple structure and convenient operation, and can accurately observe the volume deformation condition in the concrete solidification process in real time. The arc-shaped tray arranged at the upper end of the embedded part can be tangent to the spherical body at the lower end of the transmission rod, so that smooth contact is realized, the contact area between the embedded part and the transmission rod is reduced by phase change, the embedded part is prevented from inclining due to uneven solidification and deformation of concrete, and the deformation transmission precision is improved. According to the invention, the transmission rod is arranged between the embedded part and the dial indicator, so that the dial indicator is only subjected to force in the direction of the measuring rod, the embedded part is prevented from being in direct contact with the dial indicator, and the damage of the dial indicator is prevented.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a schematic structural view of an embedment of the invention.
In the figure: 1. a dial indicator; 2. a transfer lever; 3. a barrel; 4. a base; 5. a support bar; 6. embedding parts; 7. a connecting member; 8. a screw; 9. an arc-shaped tray.
Detailed Description
Example 1: a test instrument for the volume linear deformation of concrete.
As shown in figure 1, the testing instrument for the concrete volume linear deformation comprises an embedded part 6, a base 4, a cylinder 3, a supporting rod 5 and a dial indicator 1. The base 4 is made by the stainless steel sheet that thickness is 10mm, and the welding has 20mm height on base 4, and the internal diameter is 100mm, and thickness is 3 mm's stainless steel ring, is equipped with the screw thread on its inside wall for be connected fixedly with barrel 3. The cylinder 3 is a round tubular structure and made of stainless steel, the outer diameter of the cylinder is 100mm, the height of the cylinder is 300mm, and the wall thickness of the cylinder is 2.1 mm. The outer surface of the lower end of the cylinder body 3 is provided with a thread with the height of 20 mm. When the device is used, the barrel 3 is in threaded connection with the stainless steel ring on the base 4 through threads at the lower end, and the base 4 and the barrel 3 are fixedly connected. The base 4 and the barrel 3 are in threaded connection, so that the solidified concrete can be quickly demoulded, and the detection tool can be used repeatedly.
The support rod 5 is a straight rod, the surface of the lower end of the support rod is provided with threads, and threaded holes corresponding to the threads on the support rod 5 are formed beside the stainless steel ring on the base 4. When the invention is used, the supporting rod 5 is vertically arranged relative to the base 4 and is connected with the base 4 through threads.
The embedded part 6 comprises a screw 8 and an arc tray 9 arranged at the top end of the screw 8, and as shown in fig. 2, the arc tray 9 is a circular arc tray with the bottom connected with the top of the screw 8 and an upward opening. According to the invention, after the cylinder 3 is filled with concrete to be tested, the screw 8 at the lower part of the embedded part 6 is vertically inserted into the concrete of the cylinder 3 from the opening at the upper end of the cylinder 3, and the arc-shaped tray 9 of the embedded part 6 is exposed out of the concrete. The dial indicator 1 comprises a dial plate and a measuring rod connected with the dial plate, the dial indicator 1 is installed right above an arc-shaped tray 9 of the embedded part 6 through a connecting piece 7 connected with the supporting rod 5, the measuring rod of the installed dial indicator 1 is vertically arranged, and the setting height of the dial indicator 1 can be adjusted by adjusting the connecting piece 7.
Still be equipped with transmission rod 2 between built-in fitting 6 and the measuring staff of amesdial 1, transmission rod 2 vertically wears to establish in the lantern ring, and the lantern ring links together with the bracing piece through horizontal connecting rod again. The transfer rod 2 can slide up and down in the lantern ring, and the lantern ring plays a limiting role in the transfer rod 2. The transmission rod 2 is a straight rod, and the lower end of the transmission rod is connected with a spherical body. When the transmission device is used, the top of the transmission rod 2 is in contact with the end part of the measuring rod of the dial indicator 1, the spherical surface body of the transmission rod 2 is abutted against the inner surface of the arc-shaped tray 9 of the embedded part 6, and the design of the arc-shaped tray 9 on the embedded part 6 is changed, so that the contact area between the embedded part 6 and the transmission rod 2 is reduced. According to the invention, the transmission rod 2 is in smooth contact with the embedded part 6 through the cambered surface, so that the embedded part 6 can accurately transmit the deformation of the concrete to the transmission rod 2, the transmission rod 2 can transmit the deformation to the dial indicator 1, and the deformation of the concrete can be read through the dial indicator 1.
The invention has the following advantages:
1. the stainless steel material is adopted, and the advantages of difficult deformation, compact surface and easy demoulding under the influence of external factors can be fully utilized.
2. The embedded part 6 with the arc-shaped tray 9 arranged at the upper end can be in good contact with the transmission rod 2, and the situation that the inner surface of the hemisphere is polluted when the poured concrete is avoided because the edge of the arc-shaped tray 9 is higher than the surface of the concrete.
3. Transfer bar 2 only produces vertical displacement under the restraint of the lantern ring, has avoided amesdial 1 and concrete direct contact can lead to the condition of test error because of inhomogeneous deformation, has increased the experimental data degree of accuracy.
4. The device can test the linear deformation of the concrete in the process from initial setting to final setting, and can continuously measure the concrete deformation in the curing period. The invention is light and convenient, and is easy to carry and store.
Example 2: a method for testing the volume linear deformation of concrete.
Referring to fig. 1, the method for testing the volume linear deformation of the concrete comprises the following steps:
a. a testing apparatus for the linear deformation of concrete volume as described in example 1 was prepared, and the structure thereof will not be described in detail.
b. And (3) coating a release agent or engine oil on the inner wall of the cylinder body 3 and the surface of the base in the cylinder body 3, so that the solidified concrete in the cylinder body can be taken out smoothly after the test is finished, and the test instrument can be used repeatedly.
c. Liquid concrete is filled into the cylinder 3 from the upper end opening of the cylinder 3, in order to uniformly fill the concrete, reinforcing steel bars are continuously inserted and tamped in the filling process, and after the filling is finished, floating slurry on the surface needs to be scraped off to ensure the accuracy of the experiment.
d. After the concrete is filled, the screw 8 at the lower part of the embedded part 6 is vertically inserted into the concrete in the cylinder 3 from the opening at the upper end of the cylinder 3, and the arc-shaped tray 9 at the upper part is leaked out of the top of the concrete. The embedded part 6 should be inserted into the central area of the cylinder 3 as much as possible to ensure the accuracy of the experimental data.
e. A supporting rod 5 is arranged on a base 4, and a transmission rod 2 is sleeved in a sleeve ring on the supporting rod 5 in a penetrating mode, so that the lower end of the transmission rod 2 is abutted against an arc-shaped tray 9 of an embedded part 6.
f. Install amesdial 1 on bracing piece 5 through connecting piece 7, make the tip of the graduated flask of amesdial 1 and the top of transfer lever 2 contact, adjust the dial plate pointer on the amesdial 1 and make its median position of instructing the dial plate.
g. The dial plate reading of the dial gauge 1 is regularly read, and then the linear deformation curve of the volume of the concrete in the whole process from initial setting to final setting can be obtained.
Claims (5)
1. The utility model provides a concrete volume linear deformation tester, characterized by includes:
the base is used for fixing the support rod and the bearing cylinder;
the cylinder body is a barrel-shaped body with an upper opening, the lower end of the cylinder body is fixed on the base, and the cylinder body is used for containing concrete to be tested;
the embedded part comprises a screw and an arc-shaped tray arranged at the top of the screw, the screw is used for being embedded into the concrete to be tested from the top, and the arc-shaped tray is exposed at the top of the concrete to be tested;
a support rod standing on the base;
the connecting rod is transversely connected to the supporting rod and is used for sleeving the transfer rod;
the dial indicator is used for detecting the volume linear deformation of the concrete through the embedded part; and
and the transmission rod is longitudinally arranged and abutted between the measuring rod of the dial indicator and the arc-shaped tray of the embedded part, and is used for upwards transmitting the longitudinal displacement of the embedded part generated along with the concrete to be detected to the dial indicator.
2. The linear deformation tester for concrete volume according to claim 1, wherein the transmission rod is a straight rod, and the lower end of the transmission rod is a spherical body for contacting with the inner tray surface of the arc tray of the embedded part.
3. The linear deformation tester for concrete volume according to claim 1, wherein the base is provided with an annular protrusion with threads on the inner side, and the lower end of the barrel is connected with the annular protrusion through threads so as to be fixedly connected with the base.
4. A linear deformation tester for concrete volume according to claim 1, wherein the lower end of the support rod is screwed into the threaded hole of the base through the surface thread.
5. A method for testing the volume linear deformation of concrete is characterized by comprising the following steps:
a. preparing a concrete volume linear deformation tester as claimed in claim 1;
b. coating a release agent or engine oil on the inner wall of the cylinder body and the surface of a base in the cylinder body;
c. uniformly filling concrete to be tested into the cylinder from the upper end opening of the cylinder;
d. inserting the lower screw of the embedded part into the concrete to be tested from the opening at the upper end of the cylinder;
e. mounting a support rod on the base, sleeving the transmission rod in a sleeve ring on the support rod in a penetrating manner, and enabling the lower end of the transmission rod to abut against the upper part of the embedded part;
f. installing a dial indicator on the supporting rod, enabling a measuring rod of the dial indicator to be in contact with the upper end of the transmission rod, and adjusting a pointer of the dial indicator to a median position;
g. and reading the dial indicator at regular intervals to obtain a linear deformation curve of the volume of the concrete to be measured.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910494827.5A CN110243268B (en) | 2019-06-10 | 2019-06-10 | Concrete volume linear deformation tester and testing method |
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| CN201910494827.5A CN110243268B (en) | 2019-06-10 | 2019-06-10 | Concrete volume linear deformation tester and testing method |
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| CN110243268A CN110243268A (en) | 2019-09-17 |
| CN110243268B true CN110243268B (en) | 2021-06-04 |
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| CN112485189B (en) * | 2020-11-23 | 2023-08-22 | 中建商品混凝土有限公司 | Device and method for testing volume compression rate of lightweight aggregate concrete mixture |
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| CN201508358U (en) * | 2009-09-23 | 2010-06-16 | 交通部公路科学研究所 | Early expansion and contraction tester of concrete road slab bottom grouting material |
| CN201748898U (en) * | 2010-06-21 | 2011-02-16 | 宁波市产品质量监督检验研究院 | Thermal deformation detecting instrument |
| CN202903116U (en) * | 2012-11-07 | 2013-04-24 | 汤繁华 | Simple apparatus for measuring high-temperature deflection deformation of concrete column |
| CN203025187U (en) * | 2013-01-17 | 2013-06-26 | 山西省交通规划勘察设计院 | Concrete shrinking percentage detection device |
| CN104180738A (en) * | 2013-05-27 | 2014-12-03 | 江苏腾达环境工程有限公司 | Measurement tool for front ball head of oil cylinder |
| CN205808308U (en) * | 2016-07-13 | 2016-12-14 | 西北民族大学 | A kind of device of quick detection tunnel surrounding internal displacement |
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2019
- 2019-06-10 CN CN201910494827.5A patent/CN110243268B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201508358U (en) * | 2009-09-23 | 2010-06-16 | 交通部公路科学研究所 | Early expansion and contraction tester of concrete road slab bottom grouting material |
| CN201748898U (en) * | 2010-06-21 | 2011-02-16 | 宁波市产品质量监督检验研究院 | Thermal deformation detecting instrument |
| CN202903116U (en) * | 2012-11-07 | 2013-04-24 | 汤繁华 | Simple apparatus for measuring high-temperature deflection deformation of concrete column |
| CN203025187U (en) * | 2013-01-17 | 2013-06-26 | 山西省交通规划勘察设计院 | Concrete shrinking percentage detection device |
| CN104180738A (en) * | 2013-05-27 | 2014-12-03 | 江苏腾达环境工程有限公司 | Measurement tool for front ball head of oil cylinder |
| CN205808308U (en) * | 2016-07-13 | 2016-12-14 | 西北民族大学 | A kind of device of quick detection tunnel surrounding internal displacement |
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